490 JOURNAL, BOMBAY NATURAL HIST. SOCIETY, Vol. XXVI. 



Genus — Brachydiplax. 



Fig. 30. — a. Male sexual organs of B. sobrina. b. Female sexual organs 

 of same. c. Male sexual organs of B. farinosa. d. Female 

 sexual organs of same. 



Brachydiplax, Brauer, 1868. 



Microthemis, Brauer, Kirby. 



Head small or moderately large ; eyes moderately contiguous ; forehead 

 narrow, somewhat prominent, the foreborder a little rounded ; suture rather 

 shallow; vesicle very small, rounded. 



Prothorax variable, the lobe small or large, angulated and projecting out- 

 ward. Either notched or entire, furnished with a ruff of long hairs. 



Thorax moderately robust. 



Legs long and slim. Male : hind femora with not very numerous, widely 

 spaced spines of imiform size and length or nearly so, the mid femora with 

 less numerous spines and a long one at the distal end ; tibial spines numerous, 

 slim and tolerably short ; claw-hooks small, situated near the apex. 



Abdomen at the base, slightly to strongly dilated, then tapering gradually 

 to the end, short or relatively long. No transverse ridge on the 4th segment. 

 Superior anal appendages with a marked angulation beneath in the male, slim. 



Wings long, moderately narrow ; reticulation very open ; trigone in the 

 forewing broad, in line with the trigone of the hindwing; relation of the trigone 

 in the forewing to hypertrigone about a right angle ; sectors of arc in both wings 

 fused ; arc between the 1st and 2nd antenodal nervures ; 8th nervure in the 

 hindwing arising from the anal angle of the trigone ; 6 to 9 antenodal 

 nervures, the final complete ; trigone in the hindwing a little distal to the arc ; 1 

 cubital nervure to all wings ; all trigones and hypertrigones entire ; subtrigone 

 in the forewing 1 to 3 cells ; no supplementary nervures to the bridge ; 4th 

 nervure without any perceptible vmdulation or with only a slight costalwards 

 convexity ; 1 row of cells between 5 and 5a ; 2 rows of cells in the discoidal 

 field, the latter dilated at the termen ; 8th nervure strongly curved ; loop with 

 a broad, outer angle, apex broad and blunt, the cells between its inner border 

 and the base of the wing distinctly arranged in transverse rows. Stigma either 

 medium sized or small. Membrane moderately large. 



Key to Species. 



A, Lamina of the male sexual organs large. Antenodal 



nervures 7 B. sobrina. 



B. Lamina of the male sexual organs small. Antenodal 



nervures 8 to 9 B. fariiiosa. 



